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Q.

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is1 KΩ , then the input signal voltage is

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a

10 mV

b

20 mV

c

30 mV

d

15 mV

answer is B.

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Detailed Solution

Here, RC=2kΩ=2000Ω,V0=4 Vβ=100,RB=1kΩ=1000Ω,Vi=? Voltage gain, A=βRCRB=100×20001000=200 Also, A=V0Vi or, Vi=V0A=4200=2100 V=20mV
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For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is1 KΩ , then the input signal voltage is